[1] Univ British Columbia, Fac Med, Vancouver, BC, Canada
[2] Univ British Columbia, Dept Dermatol & Skin Sci, Vancouver, BC, Canada
[3] Univ Toronto, Div Dermatol, Toronto, ON, Canada
[4] Lynde Inst Dermatol, Markham, ON, Canada
[5] Univ British Columbia, Fac Med, 2350 Hlth Sci Mall, Vancouver, BC V6T 1Z3, Canada